c# - How can I get object instance from ()=>foo.Title expression -

i have simple class property

class foo  {      string title { get; set; }  } 

i trying simplify data binding calling function like

bindtotext(titletextbox, ()=>foo.title ); 

which declared like

void bindtotext<t>(control control, expression<func<t>> property) {     var mex = property.body memberexpression;     string name = mex.member.name;      control.databindings.add("text", ??? , name); } 

so put in ??? instance of foo class. how refernce calling foo instance lambda expression?

edit: instance should there somewhere because can call property.compile() , create delegate uses foo instance inside bindtotext function. question if can done without adding reference instance in function parameters. call upon occum's razor yield simplest solution.

edit 2: many have failed notice closure exists in accessing instance of foo inside function, if compile lambda. how come compiler knows find instance, , don't? insist there has answer, without having pass argument.

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solution

thanks virtualblackfox solution such:

void bindtext<t>(textboxbase text, expression<func<t>> property) {     var mex = property.body memberexpression;     string name = mex.member.name;     var fex = mex.expression memberexpression;     var cex = fex.expression constantexpression;                 var fld = fex.member fieldinfo;     var x = fld.getvalue(cex.value);     text.databindings.add("text", x, name);             } 

which alows me type bindtext(titletext, () => foo.title);.

small linqpad sample of want :

void foo<t>(expression<func<t>> prop) {     var propertygetexpression = prop.body memberexpression;      // display property accessing, here "height"     propertygetexpression.member.name.dump();      // "s" replaced field access on compiler-generated class closure     var fieldonclosureexpression = propertygetexpression.expression memberexpression;      // find compiler-generated class     var closureclassexpression = fieldonclosureexpression.expression constantexpression;     var closureclassinstance = closureclassexpression.value;      // find field value, in case it's reference "s" variable     var closurefieldinfo = fieldonclosureexpression.member fieldinfo;     var closurefieldvalue = closurefieldinfo.getvalue(closureclassinstance);      closurefieldvalue.dump();      // know expression property access propertyinfo instance     // , access value (yes compiling expression have been simpler :d)     var propertyinfo = propertygetexpression.member propertyinfo;     var propertyvalue = propertyinfo.getvalue(closurefieldvalue, null);     propertyvalue.dump(); }  void main() {     string s = "hello world";     foo(() => s.length); }